Canadian application, no grantCanada
Manhole with extension wings
CA 2300290 A1 · Owner: Wilkinson Heavy Precast Limited · Inventors: Tran-Quoc-Nam, John
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A manhole for a storm sewage system comprising a structure having at least one wall extending from the base of the manhole.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed March 7, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 7, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 7, 2022.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMarch 7, 2000
GrantedNo grant recorded
Term endedMarch 7, 2020
Patent numberCA 2300290 A1
Classification (IPC)E02D29/12
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.